Micro-revert of #251.

If dependent xacros include the ur* urdfs, but don't use Jade+ xacro, 'pi'
will be undefined otherwise.

And remove gazebo_ros_pkgs, as it is a metapackage.

Instead, depend on the individual plugin packages needed.

Fix xacro warnings in Jade

Depend on new moveit_kinematics pkg now that MoveIt has moved the kinematics plugins.

Add prefix parameter in common launch

Adding joint limit variables in .xacro.urdf files

We want to set a prefix when starting the ur_common.launch, so we add
the prefix argument and set the parameter for the driver.

Updates from latest release

add missing dependency for moveit_simple_controller_manager

travis support for indigo

Ur kin constants

Moved SetIO FUN constants from driver.py to relevant srv file

Ur3 moveit config

updates from ros

Moved SetIO FUN constants from driver.py to relevant srv file for easier interaction from other files